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Optimised adaptive procedures and analysis methods for conducting speech-in-noise tests.

Nicholas Herbert1, Matthias Keller1, Peter Derleth1

  • 1Research & Development, Sonova AG, Stäfa, Switzerland.

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|July 6, 2022
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Summary

Accurate speech-in-noise testing is crucial for audiology. This study found that while 50% intelligibility estimation is reliable, 75% requires more stimuli, with Bayesian methods showing superior performance.

Keywords:
Adult or general hearing screeningpsychoacoustics/hearing sciencespeech intelligibilityspeech-in-noise

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Area of Science:

  • Audiology
  • Speech perception research
  • Psychoacoustics

Background:

  • Speech-in-noise testing is essential for audiological evaluations.
  • Standardization of test methods is needed for consistent administration.
  • Adaptive procedures and analysis methods are key to accurate speech testing.

Purpose of the Study:

  • To evaluate the accuracy and reliability of various Bayesian and non-Bayesian adaptive procedures for speech-in-noise testing.
  • To compare different data analysis methods for speech intelligibility assessment.
  • To identify optimal methods for standardized speech-in-noise test administration.

Main Methods:

  • Simulated matrix sentence tests with varying sentence counts (10-50) and target intelligibilities (50%, 75%).
  • Modeled listeners with diverse characteristics were used for simulations.
  • Assessed seven measurement procedures and three data analysis techniques.

Main Results:

  • Estimation of 50% speech intelligibility demonstrated high accuracy and reliability, even with fewer stimuli.
  • Achieving 75% intelligibility showed reduced accuracy, necessitating more stimuli.
  • Certain Bayesian procedures outperformed others in estimating 75% intelligibility and psychometric function width.

Conclusions:

  • A standardized procedure could enhance the consistency of matrix sentence tests across intelligibility levels.
  • Candidate adaptive procedures and analysis methods were identified and discussed.
  • Findings may extend to other speech materials, with further human participant testing recommended.